Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3b6d5bd6d2ba5bbbf9297a920611812921244a83812a798394d057ad798b9a39' 
  AND token = '+d8mtdmNVngarTT5XDeiC8VbzZO8NO5/9erMVc/1rkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}